Power Supply And Relay Contacts - Siemens simatic hmi op27 Equipment Manual

13.1

Power Supply and Relay Contacts

Power supply
Connect the power supply for the OP to the 4-pin plug connector on the under-
side of the OP. Use the 4-pin terminal block supplied with the OP for this pur-
pose. The terminal block is designed for cables having a cross-section not
larger than 2.5 mm
mation on the power supply requirements.
Relay contacts
Messages on the OP can trigger visual or acoustic signals (light, flashing light,
buzzer, horn, siren etc.) by tripping an internal relay, if configured. The relay
contacts are also carried to the 4-pin plug connector.
The illustration shows the assignment of the 4-pin plug connector for the
power supply and the relay contacts.
!
Temperature
A sensor monitors the temperature on the inside of the OP37. The contacts of
monitoring for
the internal relay close if the temperature exceeds the permissible limit value.
OP37 The relay contacts are carried to a 2-pin plug connector. This connector can be
used to drive an external fan, for instance.
The diagram illustrates the assignment of the 2-pin plug connector.
Ground Connect the ground connection
connection use the grounding screwdriver supplied with the OP.
OP27, OP37 Equipment Manual
Release 05/99
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2
. Please refer to the technical data in Appendix A for infor-
1 2 3 4 Relay contacts (NO contacts)
Rating 24 V DC; 0.3 A
(no inductive load)
GND
+ 24 V DC
Caution
S
With a 24 V supply, make sure that the extra-low voltage is safely isolated.
Use only power supply units complying with IEC 364-4-41 or
HD 384.04.41 (VDE 0100, Part 410).
S
The supply voltage must be within the specified voltage range. Voltages
outside this range can cause malfunctions.
1 2 Relay contacts (NO contacts)
Rating 24 V DC; 0.3 A
(no inductive load)
of the OP to the cabinet ground. To do so,
Electrical Installation
13-3